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In Fig. 30-58, R = 15 Omega, L = 15 H , ...

In Fig. 30-58, R = 15 `Omega`, L = 15 H , the ideal ba ttery has E = 10 V, and the fuse in the upper branch is an ideal 3.0 A fuse. It has zero resistance as long as the current through it remains less than 3.0 A. lf the current reaches 3.0 A, the fuse "blows" and thereafter has infinite resistance. Switch S is closed at time t = 0. (a) When does the fuse blow? (b) Sketch a graph of the current i through the inductor as a function of time. Mark the time at which the fuse blows.

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(a) 4.5 s
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